**Sum of Joint Linear Speeds Principle**. This principle states that the linear speed of any point on the human body is the summation of linear speeds at that point caused by individual joint angular velocities. In general terms, any joint angular velocity will cause all points on a rotating body segment connected at the joint, and all points on any body segment attached to that rotating body segment, to move with linear speed. A second or a third joint's angular velocity will do the same. The linear speed of any common body segment will then be sum (addition) of the linear speeds of segment caused by each individual joint's angular velocity.

Click on "read more" to view my description of the Real-World Application of the Sum of Joint Linear Speeds principle to the Running and Walking Biomechanical Model for Minimum Movement Time.